You add the rpmfusion repo and install a few nvidia packages from there. Kernel modules are then built for the driver. If secure boot is used, they need to be signed too. Sometimes the grub entry isnt updated and doesnt load nvidia drivers. Sometimes you boot into a black screen, sometimes Wayland throws a hissy fit. Hardware accelerated video decoding needs more packages, in browsers it may need extra configuration..
The components are all there and they work, but sometimes the stars don't align and you just curse a little and wonder why you didn't just buy AMD because that, just works.

In the simplest case, absolutely. I ran into black screens and wayland issues due to a combination of needing to enable simpledrm in the command line and working with secure boot. Not too much extra once you figure it out, though.

It's a couple commands and laid out cookbook style. Fedora has a very good document page on installing nVidia drivers. And the installation is generally very smooth.

The biggest hang up for first time users is understanding that you need to wait for everything to build before doing sudo systemctl reboot. How long do you need to wait? No one really knows. There is no progress bar or any other notification that the building is done successfully. You just wait and then take a leap of faith into that dark abyss and hope for the best.

Typically, it's recommended to wait “at least 5 minutes”. Maybe more. I always waited around 10 minutes, (or one cup of tea) to be sure. But some users reported needing to wait was much as 20 minutes for everything to build. YMMV